TRT400 is a three-phase, fully automatic test set specially designed for turns ratio, phase shift and excitation current measurements of power, distribution and instrument transformers. TRT400 determines transformer turns ratio by accurately measuring the voltages across the unloaded transformer windings and then displaying a ratio of these voltages.

Test voltages from 1 V AC up to 430 V AC

Ratio range 0,8 – 50 000

The best ratio accuracy of 0,03%

Built-in tap changer control unit

Built-in USB flash drive

True three-phase and single-phase test voltages

Automatic vector group detection

Detailed analysis of test results

Pre-programming test templates

Lightweight – only 9 kg

TRT400 is the most accurate turns ratio tester on the market. True three-phase test voltage allows testing any type of transformer, including special transformers like phase shifting, arc furnace, rectifier transformers, etc.